WAY too many....they became democrats as the union movements grew and grew....they were mostly laborers and fell under the democrat way of thinking....now is is "my family has always voted democrat so I do too...
That's how my family was, dad was a teamster and mom, in her later years worked as a machinist and was a union steward.
I was first eligible to vote in 1960 and voted for Kennedy.....that was the last time, other than in a local election or two, that I voted for a democrat.....didn't take me too long to wake up!!!
For many, it might also have something to do with living in or around large cities.